import cgi
import datetime
import urllib
import wsgiref.handlers

from google.appengine.ext import db
from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app


class Greeting(db.Model):
  """Models an individual Guestbook entry with an author, content, and date."""
  author = db.UserProperty()
  content = db.StringProperty(multiline=True)
  date = db.DateTimeProperty(auto_now_add=True)


def guestbook_key(guestbook_name=None):
  """Constructs a datastore key for a Guestbook entity with guestbook_name."""
  return db.Key.from_path('Guestbook', guestbook_name or 'default_guestbook')


class MainPage(webapp.RequestHandler):
  def get(self):
    self.response.out.write('<html><body>')
    guestbook_name=self.request.get('guestbook_name')

    # Ancestor Queries, as shown here, are strongly consistent with the High
    # Replication datastore. Queries that span entity groups are eventually
    # consistent. If we omitted the ancestor from this query there would be a
    # slight chance that Greeting that had just been written would not show up
    # in a query.
    greetings = db.GqlQuery("SELECT * "
                            "FROM Greeting "
                            "WHERE ANCESTOR IS :1 "
                            "ORDER BY date DESC LIMIT 10",
                            guestbook_key(guestbook_name))

    for greeting in greetings:
      if greeting.author:
        self.response.out.write(
            '<b>%s</b> wrote:' % greeting.author.nickname())
      else:
        self.response.out.write('An anonymous person wrote:')
      self.response.out.write('<blockquote>%s</blockquote>' %
                              cgi.escape(greeting.content))

    self.response.out.write("""
          <form action="/sign?%s" method="post">
            <div><textarea name="content" rows="3" cols="60"></textarea></div>
            <div><input type="submit" value="Sign Guestbook"></div>
          </form>
          <hr>
          <form>Guestbook name: <input value="%s" name="guestbook_name">
          <input type="submit" value="switch"></form>
        </body>
      </html>""" % (urllib.urlencode({'guestbook_name': guestbook_name}),
                          cgi.escape(guestbook_name)))


class Guestbook(webapp.RequestHandler):
  def post(self):
    # We set the same parent key on the 'Greeting' to ensure each greeting is in
    # the same entity group. Queries across the single entity group will be
    # consistent. However, the write rate to a single entity group should
    # be limited to ~1/second.
    guestbook_name = self.request.get('guestbook_name')
    greeting = Greeting(parent=guestbook_key(guestbook_name))

    if users.get_current_user():
      greeting.author = users.get_current_user()

    greeting.content = self.request.get('content')
    greeting.put()
    self.redirect('/?' + urllib.urlencode({'guestbook_name': guestbook_name}))


application = webapp.WSGIApplication([
  ('/', MainPage),
  ('/sign', Guestbook)
], debug=True)


def main():
  run_wsgi_app(application)


if __name__ == '__main__':
  main()


# from google.appengine.api import users
# from google.appengine.ext import webapp
# from google.appengine.ext.webapp.util import run_wsgi_app
# 
# class MainPage(webapp.RequestHandler):
#     def get(self):
#         self.response.out.write("""
#           <html>
#             <body>
#               <form action="/sign" method="post">
#                 <div><textarea name="content" rows="3" cols="60"></textarea></div>
#                 <div><input type="submit" value="Sign Guestbook"></div>
#               </form>
#             </body>
#           </html>""")
# 
# 
# class Guestbook(webapp.RequestHandler):
# import cgi
#     def post(self):
#         self.response.out.write('<html><body>You wrote:<pre>')
#         self.response.out.write(cgi.escape(self.request.get('content')))
#         self.response.out.write('</pre></body></html>')
# 
# application = webapp.WSGIApplication(
#                                      [('/', MainPage),
#                                       ('/sign', Guestbook)],
#                                      debug=True)
# 
# def main():
#     run_wsgi_app(application)
# 
# if __name__ == "__main__":
#     main()
# print 'Content-Type: text/plain'
# print ''
# print 'Hello, bitch'
# 
# from google.appengine.ext import webapp
# from google.appengine.ext.webapp.util import run_wsgi_app
# 
# class MainPage(webapp.RequestHandler):
#     def get(self):
#         self.response.headers['Content-Type'] = 'text/plain'
#         self.response.out.write('Hello, webapp World!')
# 
# application = webapp.WSGIApplication(
#                                      [('/', MainPage)],
#                                      debug=True)
# 
# def main():
#     run_wsgi_app(application)
# 
# if __name__ == "__main__":
#     main()